The effect of width of facial canal in patients with idiopathic peripheral facial paralysis on the development of paralysis.

The aim of this prospective study is to investigate whether the possible stenosis due to anatomic variations of labyrinthine segment (LS), tympanic segment (TS) and mastoid segment (MS) of the facial canal in the temporal bone is a predisposing factor in the development of paralysis. 22 patients with idiopathic peripheral facial paralysis (IPFP) were included in the study. Multi-slice computed tomography (MSCT) with 64 detectors was used for temporal bone imaging of the patients. Reconstruction images in axial, coronal and sagittal planes were created in workstation computers from the captured images. The diameters and lengths of LS, TS and MS of the facial canal were measured. The mean values of LD, ND and SL of LS were 1.31 +/- 0.39, 0.91 +/- 0.27, 4.17 +/- 0.48 in patient group and 1.26 +/- 0.29, 0.95 +/- 0.21, 4.60 +/- 1.36 in control group, respectively. The mean values of LD, ND and SL of TS were 1.11 +/- 0.22, 0.90 +/- 0.14, 12.63 +/- 1.47 in patient group and 1.17 +/- 0.23, 0.85 +/- 0.24, 12.10 +/- 1.79 in control group, respectively. The mean values of LD, ND and SL of MS were 1.80 +/- 0.30, 1.44 +/- 0.29 vs. 14.3 +/- 1.90 in patient group 1.74 +/- 0.38, 1.40 +/- 0.29, 14.15 +/- 2.16 in control group, respectively. The measurements of the parameters of all three segments in patient group and control group were similar. Similar results between patient and control group were obtained in this study investigating the effect of stenosis in facial canal in the development of IPFP.